Calculate the exact age difference between two people. Enter their birth dates to see who is older and the gap in years, months, and days.
Runs in your browser · No data stored · No signup
Gregorian calendar difference between two dates. For official legal decisions, confirm with the relevant authority.
Enter two dates of birth. The calculator finds the earlier birthday, then counts complete years, leftover months, and leftover days. That is the exact age difference—the same answer as “how many years apart are we?” or “how much older is someone?”
Age gap means the same thing. The gap between two fixed birth dates does not change as both people get older. Order does not matter: reversed dates still label the older person.
An optional date mode uses the same math for any two calendar dates that are not birthdays. Calculation stays in your browser.
Two birth dates → exact age gap in years, months, and days. That gap stays constant.
Enter Person 1 and Person 2’s dates of birth. Either order works—the earlier birthday is detected automatically.
The result appears as soon as both dates are set. On a phone, use Calculate age difference to jump to it.
The first lines are who is older and the exact years, months, and days. Totals (days, weeks, months, hours) and each person’s age today sit underneath.
Copy or share the result. For one person’s exact age from a single date of birth, open the Age Calculator.
Enter both birthdays. Years are completed years; months and days finish the exact gap so you are not rounding “about five years.”
The earlier birth date is the older person. The result states who is older—and therefore who is younger—by years, months, and days.
Full dates beat birth years. Subtracting 1990 from 1995 can look like five years when the real gap is four years and some months.
Compare two siblings’ dates of birth for spacing that year-only math misses—useful for family records and “how far apart are they?”
See the exact age gap between partners from two birth dates. This page reports calendar difference only—not dating advice.
The age difference between two birth dates is also the older person’s age on the younger person’s birthday.
Input
Person 1: 2012-08-20 · Person 2: 2018-04-10Output
5 years, 7 months, 21 days · Person 1 is olderComplete years from August 20, 2012 to August 20, 2017 (5), then months toward April 2018, then leftover days after borrowing.
Input
Person 1: 1990-04-17 · Person 2: 1994-08-29Output
4 years, 4 months, 12 days · Person 1 is olderYear subtraction alone says 4 years. Months and days complete the exact difference between the two birthdays.
Input
Person 1: 2000-02-29 · Person 2: 2024-03-01Output
24 years, 0 months, 1 dayLeap-day birthdays are valid. Intervening February 29s are included in the day count.
The calculator takes the earlier date and the later date, then subtracts year, month, and day with calendar borrowing: if days go negative, it borrows the previous month’s length; if months go negative, it borrows 12 months from the year. Total days apart is a separate count of every calendar day between the two dates, including February 29 in leap years.
Formula
Age gap = later birth date − earlier birth date → years, months, days
Total days = calendar day count between the two datesEach URL answers one job so the pages do not compete for the same query.
| Tool | Best for |
|---|---|
| Age Difference Calculator (this page) | Gap between two people or two birthdays |
| Age Calculator | One person’s exact age from a date of birth |
| Date Calculator | Add/subtract days or days between dates for planning |
| Time Duration Calculator | Hours and minutes between two date-times |
If birthdays fall on different sides of the year, year-minus-year can be off by almost 12 months. Use full dates.
Each person ages, but the difference between two fixed birth dates stays the same.
February 29 days in the range are included in total days so multi-year gaps stay calendar-accurate.
Use the Age Calculator with a single date of birth.
Use the Date Calculator for deadline math.
Subtracting current ages is an estimate. Enter both birth dates here for an exact gap.
Continue the workflow with the right follow-up tool.
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Enter both dates of birth. The calculator returns the exact gap in years, months, and days and labels who is older. Order does not matter.
Use both full birth dates. The years figure is completed years; months and days complete the exact “years apart” answer.
The person with the earlier birthday is older. The other is younger by the same years, months, and days.
In everyday English they mean the same thing: how far apart two people are in age.
No. Each person ages, but the gap between two fixed birth dates stays the same.
That age is the same as the age difference. The older person’s age on the younger person’s birthday is the gap you see here.
Yes. Gregorian leap years are included. February 29 is a valid birth date. Leap days in the span are counted in total days.
The span is the same. The calculator uses the earlier date as the start and still reports who is older.
Year-only subtraction is approximate. Enter month and day as well—or the result can be off by nearly a year.
After both dates are entered, total days appears with the exact years/months/days gap.
Yes, it is free with no signup. Calculation runs locally. Dates are not sent to EverydayTools servers.
Birth dates and other dates you enter stay in your browser—they are not uploaded to EverydayTools servers.
Uses Gregorian calendar date arithmetic with real month lengths and leap years. Results are date-based, not clock-time or time-zone precise.
Age difference is derived locally from the two dates you enter.
For personal and planning use—not legal, medical, or official identity verification. This page reports calendar difference only, not relationship advice.
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Reviewed by EverydayTools Editorial Team on 2026-09-13.
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Age difference calculator tool
Compare two birth dates
Find the exact age difference between two people—years, months, days, and who is older.